Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . Fig. 237. Menabites {Australiella) austmlis (Besairie, 1930). SAS-Z2101. X 0,84. more rounded, narrower whorl section (Fig. 230D) than the latter, and hasdifferently evolving ornament in that the ventrolateral spine weakens andbecomes absorbed in the ribbing. SAS-Z191 (Fig. 232) is very much likeM. {A.) moreti, in being more inflated and weaker ornamented than typicalM. (A.) australis, pointing to the close relationship between the two species. M. {A) antsirasiraensis lacks the depressed whorl section and loses theven
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . Fig. 237. Menabites {Australiella) austmlis (Besairie, 1930). SAS-Z2101. X 0,84. more rounded, narrower whorl section (Fig. 230D) than the latter, and hasdifferently evolving ornament in that the ventrolateral spine weakens andbecomes absorbed in the ribbing. SAS-Z191 (Fig. 232) is very much likeM. {A.) moreti, in being more inflated and weaker ornamented than typicalM. (A.) australis, pointing to the close relationship between the two species. M. {A) antsirasiraensis lacks the depressed whorl section and loses theventrolateral spine at diameters between 70 and 80 mm. 312 ANNALS OF THE SOUTH AFRICAN MUSEUM. f^-:. A B Fig. 238. Menabites (Australiella) austmlis (Besairie, 1930). SAS-Z2102. x 0,9. CRETACEOUS FAUNAS FROM SOUTH AFRICA 313 M. (A,) coronata has a whorl section (Collignon 1970, pi. 631 (fig. 2328))comparable to typical M. {A.) australis though not quite as depressedrectangular. Here the ventrolateral spines are not as strong and spatulateand about four external tubercles occur per spine. The whorl section of SAS-Z705 (Figs 234-235A) is virtually identical to that of the holotype of M. {A.)coronata, but it lacks the proliferation of external tubercles.
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
